代理错误、超时与重试排查

export PROXY_USER="YOUR_PROXY_USER"
export PROXY_PASS="YOUR_PROXY_PASSWORD"

curl --verbose --fail-with-body   --proxy "http://proxy.123proxy.cn:36923"   --proxy-user "${PROXY_USER}:${PROXY_PASS}"   --connect-timeout 15   --max-time 30   "https://httpbin.org/status/200"

# python -m pip install requests
import random
import time

import requests

RETRYABLE = {429, 500, 502, 503, 504}


def get_with_backoff(session, url, proxies, attempts=4):
    for attempt in range(attempts):
        try:
            response = session.get(
                url,
                proxies=proxies,
                timeout=(15, 30),
            )
            if response.status_code not in RETRYABLE:
                response.raise_for_status()
                return response

            retry_after = response.headers.get("Retry-After")
            if retry_after and retry_after.isdigit():
                delay = min(float(retry_after), 60)
            else:
                delay = min(2 ** attempt + random.random(), 30)
        except (requests.ConnectTimeout, requests.ReadTimeout):
            delay = min(2 ** attempt + random.random(), 30)

        if attempt == attempts - 1:
            raise RuntimeError("request exhausted retry budget")
        time.sleep(delay)

    raise RuntimeError("unreachable")